Timber Roof with Folded Plates in Anoeta, Spain
Customer Project
Madergia, a Spanish Dlubal Software customer, presents this beautiful project designed by ZÜR Studio, for which engineers were responsible with regard to the structural analysis, manufacturing, supply, and installation of the timber structure. It is a pergola roof with folded plates, placed in an open public space in the town of Anoeta.
| Architecture |
ZÜR Studio
|
| Structural Analysis |
Madergia, Efficient Timber Construction Ansoáin (Navarra), Spain
|
| Construction | CONSTRUCCIONES APLIBUR, S.L. |
Model
Structure
Regarding the floor plan, the roof has a width of 20 m (about 65 ft) and a length of 15 m (about 49 ft); the roof's slopes range between 6% and 35%. The structure, consisting of GL24h glulam timber, is supported by free-standing sawtooth-shaped rolled steel frames spanning about 13 m (about 42 ft) of the roof's width. The columns of the frame along the roof's length are 5.0 m (about 16 ft) apart. The hip and valley rafters are connected to the steel frames with hinged supports.
On some folded plates, certain rafters are spaced 0.65 m (about 2 ft) apart, fixed by tongue-and-groove boards and forming the cover for a green roof, and while other rafters under these plates are spaced 1 m (about 3 ft) apart, supporting a polycarbonate cover to improve natural lighting.
Structural Analysis
The structural analysis for the ultimate limit state, in both a normal situation and fire situations, as well as for the serviceability limit state, were calculated according to the Spanish rules of the Basic Document for Wood Structural Safety (DB-SE-M) of April 2009 and the Basic Document for Safety in case of Fire (DB-SI) of February 2010, belonging to the technical building code in force.
Computer applications used in the calculation:
- self-developed pre- and post-process spreadsheets
- Cadwork V29 Computer Aided Design program
- Dlubal RFEM 6.02 Structural Analysis and Design program
Project Location
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Timber Member Compression Perpendicular to the Grain acc. to NDS 2018 and CSA O86:19
A standard scenario in timber member construction is the ability to connect smaller members by means of bearing on a larger girder member. Additionally, member end conditions may include a similar situation where the beam is bearing on a support type. In either scenario, the beam must be designed to consider the bearing capacity perpendicular to the grain according to the NDS 2018 (Sect. 3.10.2) and the CSA O86:19 (Clause 6.5.6 and 7.5.9). In the new generation RFEM 6 and Timber Design add-on, the added feature 'design supports' now allows users to comply with the NDS and CSA bearing perpendicular to the grain design checks.
- How do I define a member as a cantilever and not as supported at both ends for serviceability or deflection design?
- How can I connect surfaces to other surfaces or members in a hinged/semi-rigid way? What are Line Hinges and Line Releases?
- How is the dimension for an equivalent round section calculated in the Timber Design add-on?
